noun
tortoiseshell bracket
A punctuation mark shaped like a tortoiseshell, used in Japanese typography. The symbol is 〔 〕.
亀甲括弧は、〔 〕のように書きます。
Tortoiseshell brackets are written like 〔 〕.
括弧 is the general term for brackets or parentheses, while 亀甲括弧 specifically refers to the tortoiseshell-shaped brackets.
From 亀甲 (tortoiseshell) + 括弧 (bracket), referring to the shape of the punctuation mark.